Cesium ion is a robust, scalable, and secure SaaS platform designed for 3D geospatial data. It allows users to upload their content, which is then optimized as 3D Tiles for efficient streaming. The platform hosts this content in the cloud, making it accessible to any device. Cesium ion provides access to curated global 3D content such as Cesium World Terrain, Bing Maps, Google Maps imagery, and Cesium OSM Buildings. Users can combine their own data with these assets to visualize it in a geospatial context, sharing the results securely or making them available through apps. The platform facilitates an end-to-end 3D workflow from data creation and capture to tiling and streaming for visualization, simulation, and gaming.